Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 356, Issue 31-32, Pages 1593-1598Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2010.05.055
Keywords
Liquid alloys L135; Modelling M280; Surface properties S480; Short-range order S150
Funding
- European Union [NMP3-CT-2004-500635]
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The energetics of mixing in Al-Nb and Nb-Ti liquid alloys have been analysed through the study of surface properties (surface tension and surface segregation), dynamic properties (chemical diffusion) and microscopic functions (concentration fluctuations in the long-wavelength limit and chemical short-range order parameter) in the frame of statistical mechanical theory in conjunction with quasi-lattice theory (QLT). The phase diagram of the Al-Nb system exhibits three intermetallic compounds in the solid state, while a relatively simple phase diagram of the Nb-Ti system indicates nearly ideal mixing behaviour in the liquid phase and two stable solid phases. Since the structure of a liquid alloy is in some respects similar to that of a crystal, the complex formation phenomenon in Al-Nb melts has been analysed by a quasi-lattice structural model for chemical complexes. The energetics and structural arrangement in Nb-Ti melts have been studied by the quasi-chemical approximation (QCA) for the regular solution model. (C) 2010 Elsevier B.V. All rights reserved.
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